linux-kernel - Re: [PATCH] hugetlb: unshare some PMDs when splitting VMAs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Y7XbymU+hy6ZJO+/@x1n>
Date:   Wed, 4 Jan 2023 15:04:26 -0500
From:   Peter Xu <peterx@...hat.com>
To:     James Houghton <jthoughton@...gle.com>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hugetlb: unshare some PMDs when splitting VMAs

On Wed, Jan 04, 2023 at 07:34:00PM +0000, James Houghton wrote:
> How about:
> 
> /*
>  * PMD sharing is only possible for PUD_SIZE-aligned address ranges
>  * in HugeTLB VMAs. If we will lose PUD_SIZE alignment due to this split,
>  * unshare PMDs in the PUD_SIZE interval surrounding addr now.
>  */

Even better, thanks.

-- 
Peter Xu